With a VoIP program such as Skype, improved voice and video quality trumps dubious interface changes any day. So we are moving to Skype 4.0. That said, some Skype users might want to skip this upgrade. If you're content with the call quality of your current version of Skype, you're happy with its look and feel, and you'd miss Skype's public chats (the new version doesn't let you add new ones), consider staying with the version you have. And of course there are competing services, such as ooVoo, to consider.